Metal sheathed cable assembly
View Patent ↗A Metal-Clad cable that includes at least two conductor assemblies within a metal armored sheath. Each conductor assembly has an electrical conductor, an insulation layer extending around and along the length of each of the electrical conductors, a jacket layer disposed around the insulating layer and a polymeric protective layer disposed around the jacket layer along the length of each of the electrical conductors. A grounding/bonding strip is disposed within the cable and is in intimate contact with an interior surface of the metal sheath. If a grounding conductor is used, it is either in cabled relationship with the two conductor assemblies or is disposed along the length of the electrical conductors and the metal sheath is disposed over the at least two conductor assemblies and the grounding conductor.
1. A Metal-Clad cable comprising
at least two conductor assemblies, each of said conductor assemblies having an electrical conductor, a layer of insulation extending around and along the length of each of said electrical conductors, a polymeric protective layer disposed around said insulation layer along the length of each of said electrical conductors, said polymeric protective layer comprising a material that is different from said layer of insulation;
a nylon jacket layer disposed between said insulation layer and said polymeric protective layer for each of said plurality of conductor assemblies; and
a metal sheath disposed over said at least two conductor assemblies.
2. The Metal-Clad cable of claim 1 further comprising grounding/bonding conductor disposed within said metal sheath and in intimate contact with an interior surface of said metal sheath along the length of said cable and said combination having an ohmic resistance to qualify as an equipment grounding conductor.
3. The Metal-Clad cable of claim 2 wherein said grounding/bonding conductor is in cabled relationship with said at least two conductor assemblies.
4. The Metal-Clad cable of claim 2 wherein said metal sheath comprises a metal strip that is helically wound around said at least two electrical conductor assemblies and said grounding conductor, said metal strip having edges that interlock.
5. The Metal-Clad cable of claim 2 further comprising a longitudinally extending spacer member disposed between the conductor assemblies and the grounding/bonding conductor, said longitudinally extending member having a cross sectional shape that generally approximates the shape of the space between the conductor assemblies and the grounding/bonding conductor.
6. The Metal-Clad cable of claim 1 wherein said metal sheath comprises a metal strip that is helically wound around said at least two electrical conductor assemblies, said metal strip having edges that interlock.
7. The Metal-Clad cable of claim 1 wherein said metal sheath comprises a metal strip that is helically wound around said at least two electrical conductor assemblies and said grounding/bonding conductor, said metal strip having edges that interlock.
8. The Metal-Clad cable of claim 1 wherein said polymeric protective layer is adapted for extrusion about the insulation layer.
9. The Metal-Clad cable of claim 1 wherein said polymeric protective layer is adapted for extrusion about said jacket layer.
10. The Metal-Clad cable of claim 1 wherein said polymeric protective layer is disposed around said jacket layer along the length of each of said electrical conductors.
11. The Metal-Clad cable of claim 1 wherein said polymeric protective layer is wrapped around said insulation layer.
12. The Metal-Clad cable of claim 1 wherein said polymeric protective layer is foamed polymeric material having air pockets filled with gas.
13. The Metal-Clad cable of claim 1 wherein said polymeric protective layer has a non-uniform cross sectional profile around said insulation layer.
14. The Metal-Clad cable of claim 13 wherein said non-uniform cross sectional profile is constructed and arranged to provide separation of said at least two conductor assemblies.
15. The Metal-Clad cable of claim 13 further comprising a grounding/bonding conductor disposed within said metal sheath wherein said non-uniform cross sectional profile is configured to provide resilient force against a surface of said grounding/bonding conductor and configured to force said conductor into direct contact with an inner surface of said metal sheath.
16. The Metal-Clad cable of claim 1 comprising a longitudinally extending space member disposed between the conductor assemblies and the grounding/bonding conductor, said longitudinally extending member having a cross sectional shape that generally approximates the shape of the space between the conductor assemblies and the grounding/bonding conductor.
17. The Metal-Clad cable of claim 16 wherein said longitudinally extending member includes resilient properties sufficient to force said grounding/bonding conductor against the inner surface of said metal sheath.
18. The Metal-Clad cable of claim 1 further comprising a grounding conductor assembly providing a grounding path that is separate from said grounding/bonding conductor and said metal sheath electrical conductor, said grounding conductor assembly comprising a grounding conductor with a layer of insulation extending around and along the length of said grounding conductor, a polymeric protective layer disposed around said insulation layer along the length of said grounding conductor, and a jacket layer disposed between the layer of insulation and the polymeric protective layer.
19. The Metal-Clad cable of claim 1 wherein said polymeric protective layer is made from a material that is different from said nylon jacket layer to enable a user to remove said protective layer from said nylon jacket layer during installation of said MC cable.
20. The Metal-Clad cable of claim 1 wherein each of the at least two conductor assemblies are individually wrapped with said layer of insulation, said nylon jacket layer, and said polymeric protective layer.
21. The Metal-Clad cable of claim 1 wherein the layer of insulation comprises polyvinylchloride.
22. The Metal-Clad cable of claim 1 wherein the polymeric protective layer, is removable from the insulation layer and the nylon jacket layer.
23. The Metal-Clad cable of claim 1 wherein the polymeric protective layer provides continued mechanical protection to the associated conductor.
24. The Metal-Clad cable of claim 1 further comprising a bare grounding/bonding conductor in cabled relationship with said at least two conductor assemblies.
25. The Metal-Clad cable of claim 24 , wherein the grounding/bonding conductor is disposed within said metal sheath and is in intimate contact with an interior surface of said metal sheath along the length of said cable.